var cbutton=document.getElementsByClassName("kz_order_top")[0].getElementsByTagName("button")[0];
var nav=document.getElementsByClassName("kz_condition")[0];
	console.log(cbutton);
EventUtil.addHandler(cbutton,"click",function(event){

	    var _event=EventUtil.getEvent(event);
	    var _target=EventUtil.getTarget(_event);

          if(_target.innerHTML=="显示筛选"){
          	nav.style.display="block";
          	_target.innerHTML="隐藏筛选";

          }else{
          	nav.style.display="none";
          	_target.innerHTML="显示筛选";
          
          }
});